81417908 has 48 divisors (see below), whose sum is σ = 171959424. Its totient is φ = 33229440.

The previous prime is 81417899. The next prime is 81417949. The reversal of 81417908 is 80971418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19241 + ... + 23087.

It is an arithmetic number, because the mean of its divisors is an integer number (3582488).

Almost surely, 2^81417908 is an apocalyptic number.

It is an amenable number.

81417908 is an abundant number, since it is smaller than the sum of its proper divisors (90541516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81417908 is a wasteful number, since it uses less digits than its factorization.

81417908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912 (or 3910 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 81417908 is about 9023.1872417677. The cubic root of 81417908 is about 433.4177032303.

The spelling of 81417908 in words is "eighty-one million, four hundred seventeen thousand, nine hundred eight".